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- Add scripts/agent.py and references/api-reference.md to all remaining skills - Update all 648 LICENSE files: copyright now reads 'Mahipal' - Add implementing-security-monitoring-with-datadog (new skill with full anatomy) - All 649 skills now have: SKILL.md, LICENSE, scripts/agent.py, references/api-reference.md
59 lines
1.7 KiB
Markdown
59 lines
1.7 KiB
Markdown
# API Reference: Web Cache Deception Attack
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## Attack Technique
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| Step | Action | Description |
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|------|--------|-------------|
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| 1 | Identify authenticated endpoint | Find URL returning personalized content |
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| 2 | Append static extension | `/account/nonexistent.css` |
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| 3 | CDN caches response | Proxy treats as static file |
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| 4 | Access cached URL unauthenticated | Receive victim's personalized data |
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## Static Extensions to Test
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| Extension | Type | Cache Likelihood |
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|-----------|------|-----------------|
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| `.css` | Stylesheet | Very High |
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| `.js` | JavaScript | Very High |
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| `.png`, `.jpg`, `.gif` | Image | High |
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| `.woff`, `.woff2` | Font | High |
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| `.pdf` | Document | Medium |
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| `.ico` | Icon | Medium |
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## Cache Detection Headers
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| Header | Cached Indicators |
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|--------|------------------|
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| `X-Cache` | HIT |
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| `CF-Cache-Status` | HIT (Cloudflare) |
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| `X-Cache-Status` | HIT (Nginx proxy_cache) |
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| `Age` | Non-zero value |
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| `X-Varnish` | Two IDs = cache hit |
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## Path Delimiter Confusion
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| Delimiter | URL Example |
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|-----------|-------------|
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| `;` | `/account;test.css` |
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| `%23` | `/account%23test.css` |
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| `%3f` | `/account%3ftest.css` |
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## Mitigation
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| Control | Description |
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|---------|-------------|
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| `Cache-Control: no-store` | Prevent caching of authenticated pages |
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| Validate file extension | Only cache actual static files |
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| `Vary: Cookie` | Separate cache by session |
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## Python Libraries
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| Library | Version | Purpose |
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|---------|---------|---------|
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| `requests` | >=2.28 | HTTP requests with/without auth |
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## References
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- PortSwigger Web Cache Deception: https://portswigger.net/web-security/web-cache-deception
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- Original Research (Omer Gil): https://omergil.blogspot.com/2017/02/web-cache-deception-attack.html
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